SDM ticket linked to catalog request

Document ID : KB000117298
Last Modified Date : 10/10/2018
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When a catalog request opens an SDM ticket, this writes the link to the SDM ticket back to the catalog request. Where is this stored in the DB?
While most request form data is in USM_REQUEST_ITEM_FORM The link between the SDM ticket and the request should be in USM_LINK_TICKET_REQUEST_ITEM